More Base… part 2

Previously Grump Admin – wrote about how to convert an IP and Subnet into binary. Using the [System.Convert]::tostring(255,2) method. So we left off with the following code snippet which will present out IP and Subnet in Binary

$IPaddress=”10.0.0.1″
$subnet=”255.255.255.0″
$ipraw = $ipaddress -split “\.”| ForEach-Object {[System.Convert]::ToString($_,2).PadLeft(8,”0″)}
$subnetraw = $subnet -split “\.”| ForEach-Object {[System.Convert]::ToString($_,2).PadLeft(8,”0″)}
write-host $($ipraw -join ” “)`n$($subnetraw -join ” “)

This is good… but as promised here is how to convert it back. Now we if we follow on and do a $ipraw – you will see the 8 bits as we did the cool padding thing right (actually we did a padleft but meh!) – as we know 8 bits is a byte so all we need to do is to convert the base two into a byte.

$rebuiltip=””
$ipraw | foreach-object {$rebuiltip=$rebuiltip +[system.convert]::tobyte($_,2)+”.”}
$rebuiltip=$rebuiltip.Substring(0,$rebuiltip.Length-1)
$rebuiltip

I think you can tell, I learned to code in BASIC!

But a smarter way – check this blog out as they do exactly what I do 🙂 but in a better way http://www.powershellmagazine.com/2012/10/16/converting-numbers-to-binary-and-back/ and Grumpy Admin doesn’t mind being out smarted sometime! (only some times!!!). So I improve my code by using their code!

$rebuiltip=””
$rebuiltip = $ipraw | foreach-object {[system.convert]::tobyte($_,2)}
$rebuiltip -join “.”

There you have it – Easy code to convert from binary back to base 10! Use their method not mine, it better code… you see it all good learning! Time for my morning coffee!

base33

Hazzy

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